Well they love the leaves on the beans, they love foraging both bean and corn fields after harvest, they also eat the grass and bugs out of the hay fields, so now they need water, shelter ( woods for the bad weather days),and roost which they find in the trees in the woods. With 75 acres and I'm guessing 40 farming and 35 woods. Then there realy is no reason if you have all the above that you couldn't keep a flock happy enough to stay on your ground if you don't have a predator problem like coyotes.